Getting Things Done

David Allen's system, universally shortened to "GTD," predates almost the entire modern to-do-app industry — most task managers you've ever used were built, explicitly or not, as software implementations of the method this book laid out in 2001. It's a productivity book that became infrastructure.

What it says

Allen's core claim is that unresolved commitments — a half-formed task, an unanswered email you're avoiding, a decision you haven't made — create background stress regardless of their actual size, because your brain keeps quietly re-litigating them. His fix is to capture every single commitment into a trusted external system the moment it appears, immediately decide the next concrete physical action for it, and review the whole system on a fixed schedule, so nothing is ever being held in memory out of fear of forgetting it.

Where it holds up

The core discipline — capture immediately, clarify the next action, review on schedule — reliably reduces the low-grade anxiety of a messy, half-remembered task list. It's also the reason almost every to-do app on your phone works the way it does.

Where it doesn't

The full system is genuinely maintenance-heavy — lists, contexts, weekly reviews — and a lot of people set it up once, then let maintaining the system itself become the new procrastination target. It's also light on solving the harder problem once you have ten valid "next actions" sitting in front of you: which one first. GTD tells you how to capture and clarify; it has less to say about how to choose.

Apply it this week

For one full day, capture every task, worry, and "I should really" the instant it crosses your mind into a single running list — no sorting, no filtering. At the end of the day, pick the top three and write down the actual next physical action for each, not the goal.